607results about "Saw chains" patented technology

A device for cutting a length of pipe includes a clamp portion for clamping around a length of pipe and a bow moveable with respect to the clamp portion that retains a loop of diamond embedded wire. The device further includes a feed for driving the bow with respect to the clamp portion and a detector for detecting bending of the wire and a control responsive to the detector for controlling feed rates. The device is made of modular parts and has synchronizing arms for clamping around a length of pipe. In one embodiment, the wheels are retained in enclosures with slots through which the cutting wire passes.

A wood-cutting band saw blade includes a cutting edge defined by a plurality of teeth spaced relative to each other, wherein each tooth includes a tip; a rake face formed on one side of the tip; a primary clearance surface formed on an opposite side of the tip relative to the rake face; a secondary clearance surface formed on an opposite side of the primary clearance surface relative to the tip; a tertiary clearance surface formed on an opposite side of the secondary clearance surface relative to the primary clearance surface; and a gullet located on an opposite side of the rake face relative to the tip and defining a depth (D) between a base surface of the gullet and the tip. Each tooth further defines a first gullet radius (R1) located between the gullet and tertiary clearance surface; a second gullet radius (R2) extending between a base surface of the gullet and the rake face; and a pitch (P) between the respective tooth and a preceding tooth in a cutting direction of the saw blade. In each tooth, R2>D>R1, D / P is within the range of about 25% to about 35% and R2 / R1≧about 1.4. R1 defines a minimum radius (Rmin) at a base of the gullet and Rmin / D>about 20%.

A saw blade having blade body supporting a leading cutting edge for cutting through a workpiece. A force and motion are applied to drive the cutting edge against the work piece as the body of the saw blade is driven with a reciprocating, rotational or linear motion transverse to the applied direction of the force. The solid rectangular cross section of a saw blade is modified to improve its ability to cut through a workpiece. The body of the blade is characerized as having cut out areas distributed throughout the blade body to capture and remove the debris from the kerf. This improved cutting performance can be further enhanced by reducing the cross section of the body. Secondary cutting edges may also be incorporated around the perimeter of the cutouts and as part of the reduced geometry portion of the blade body.

A reciprocating saw blade, for use in a portable power reciprocating saw including a chuck for releasably engaging the saw blade, includes a tang having an elongated axis and being engageable with the chuck for attaching the saw blade to the reciprocating saw. The saw further includes a blade portion having a cutting edge that defines a plurality of cutting teeth. The cutting teeth define a repeating pattern of successive groups of teeth. Each group of teeth is less than about a half inch in length, and includes a plurality of laterally offset teeth, at least one relatively high first tooth and at least one relatively low second tooth. Prior to tooth set, the at least one relatively high first tooth is at least about 0.002 inch higher than the at least one relatively low second tooth.

Improved aperturing of a web can be obtained by providing pins with an extended tapered section that is substantially convex in shape. When the tapered section is longer than the penetration depth of the pins into the receiving recesses of a female roll, frictional forces in the nip between layers are reduced. Pins with extended tapered sections can be used in devices for producing apertured composite web assemblies comprising sections of absorbent matter attached to a nonwoven web or other carrier layer.

The invention relates to a microtome, comprising a holding device with a support (3) for holding at least one portion of a processed object (4), and a severing means (6, 10, 13). Known microtomes of the aforementioned type have the disadvantage that the processed object must be fixed and there is limited freedom in the choice of guiding the cut. The invention avoids these disadvantages by the severing means comprising at least one laser radiation source (10) and means for focussing (6; 13) the laser radiation, and the beam focus (22) which has been produced by the focussing can be moved relative to the support (3) and can be guided to a location of the parting surface (19; 20) of the processed object (4) in order to effect severing of the material at this site. The invention furthermore relates to a process for microtomy which can be advantageously carried out with the microtome as claimed in the invention.

A reciprocating saw has a tooth form that decreases the cutting time of the saw blade and extends the life of the saw blade. The tooth height is longer than conventional metal cutting reciprocating saws. Also, the tooth form has a larger gullet. The tooth rake angle remains substantially constant during the life of the saw blade.

A wire slicing system and method for using it include one or more of the following features: arrangements and / or operations that relate to handling the wire; apparatus and methods that relate to wire tensioning; equipment and techniques for manipulating the workpiece; arrangements and / or operations designed for cooling and swarf (debris) removal; controls and / or automation that can be used in conjunction with these features.

A device for cutting a length of pipe includes a clamp portion for clamping around a length of pipe and a bow moveable with respect to the clamp portion that retains a loop of diamond embedded wire. The device further includes a feed for driving the bow with respect to the clamp portion and a detector for detecting bending of the wire and a control responsive to the detector for controlling feed rates. The device is made of modular parts and has synchronizing arms for clamping around a length of pipe. In one embodiment, the wheels are retained in enclosures with slots through which the cutting wire passes.

A movable machining element, for example a wall saw, can have one or more characteristics including a reversible driving head, a driving head removable from a carriage and having a quick release or quick lock mechanism, a driving head that is removable from a carriage without the use of threaded fasteners or having to unthread a holding element for removing the driving head from the carriage, a driving head with parallel, concentric or coaxial travel elements and tool driving elements, a tool driving assembly including a travel gear accessible from more than one direction, a component in the machining element having an oriented fiber or other composite incorporated in or as part of the component, an eccentric lateral adjustment assembly, or a drive shaft having a non-circular driving surface, for example a hexagonal drive shaft. In a wall saw, a blade and blade flange assembly are easily assembled on the saw or removed from the saw.

A pruning saw includes an elongated sawblade which has a line of cutting teeth. Opposite sides of the blade extending between the line of teeth and the back edge are concave. A thinnest waist between the concave sides is located closer to the line of teeth than to the back where the blade has its maximum height. A front edge of the blade forms a rounded corner where it intersects the back edge.

A replaceable saw tooth for a rotary cutting machine. The saw tooth comprises more than two cutting edges on each of two opposed faces thereof. More specifically, the saw tooth may comprise a body having two cutting faces disposed opposite each other and spaced apart by at least four side faces which are each parallel to an opposite one of the side faces. The side faces are parallel to a central axis extending between the two cutting faces. Four cutting edges are defined between the side faces and each of the two cutting faces.

A superabrasive wire saw-wound structure includes a superabrasive wire saw (10) formed with an average diameter D and a reel (1). The superabrasive wire saw (10) includes a core wire (11), a bonding material (12) surrounding a surface of the core wire (11), and a plurality of superabrasive grains (13) bonded to the surface of the core wire (11) with the bonding material (12). The reel (1) includes a peripheral surface (2) having one end (3) and the other end (4). The superabrasive wire saw (10) which is to be unreeled successively toward a workpiece is wound around the peripheral surface (2) reciprocatingly between the one end (3) and the other end (4) to be multi-layered. A pitch P for winding the superabrasive wire saw (10) around the peripheral surface (2) between the one end (3) and the other end (4) satisfies a relation of D<P<2D. According to the present invention, there can be provided a superabrasive wire saw-wound structure, a cutting device with a superabrasive wire saw, and a method of winding a superabrasive wire saw which can reduce damage to a bonding material and falling of a superabrasive grain.

A surgical saw blade operatively couples to an oscillatory power tool for oscillation about an oscillation axis (OA). The saw blade includes a plurality of cutting teeth separated from one another by a clean out opening along a distal end. The clean out opening comprises an arcuate closed end and straight side walls extending from the closed end. Each tooth comprises first and second rake surfaces and first and second relief surfaces intersecting to define first and second cutting edges, respectively. The first and second cutting edges are oppositely disposed from one another. One cutting tooth protrudes a distance (de) from one side face of the blade and the next adjacent cutting tooth protrudes the same distance (de) from the other side face of the blade to cut a groove having a width (dg) wider than the thickness (t) of the blade.

A method and apparatus is provided for cutting an elastomeric laminate that may include a layer of reinforcement cords, into a desired length without cutting through the cords. The method includes the step of cutting through the gum portion of the elastomeric composite material at a desired skive angle, and then opening up the skived cut. Next, the cord reinforcement layer is cut without severing the reinforcement cords. An elastomeric composite strip cut to the desired length is produced and has cut ends. One of the cut ends has the gum portion cut at a desired skive angle adjacent an overhang portion of the reinforcement layer. The opposite end of the elastomeric composite segment also has a skived portion to mate with the skived portion of the first cut end, and a gap in the cord ply to mate with the cord overhang of the first end, resulting in a splice. An improved anvil having independently controlled vacuum zones and adjustable width vacuum zones is also provided, as well as improved cutting mechanisms.

A saw blade incorporates an integrated cant angle. The saw blade includes a cutting portion having a toothed edge and opposite edge. The toothed edge defines a cutting plane. A shank portion extends from the cutting portion and is laterally offset from the opposite edge of the cutting portion defining a step thereat. The shank includes an end portion including a mounting edge, the mounting edge and step define a mounting plane which is angularly offset from the cutting plane.

A wood cutting band saw blade includes a cutting edge and a back edge, wherein the cutting edge is defined by a plurality of teeth spaced relative to each other. The plurality of teeth include a plurality of set teeth each having a tip, each defining a bend plane, and each including a shelf located at least partially between the tip and the bend plane for reducing saw dust passing to the kerf and accumulating on the band saw blade. Each of the set teeth may define a relief surface and a cutting surface where the relief surface extends from one side of the tip in a direction opposite that of the movement of the band saw blade and the cutting surface extends from another side of the tip. The shelf includes a shelf surface extending from the cutting surface and may terminate in a shelf tip.

Concave / convex portions are consecutively formed on a back of a band saw blade. The concave / convex portions include concave portions engageable with and disengageable from a backup guide of a band saw guide unit, and convex portions adjacent to the concave portions. A length of each of the concave / convex portions is configured to be equal to or smaller than four times a maximum pitch of a tooth top of each tooth.

A saw blade includes a circular core having a plurality of cutting elements along its periphery, and a central arbor hole. One or more gullets extend radially inward from the perimeter of the core. Each gullet includes a shape that includes at least one elongated curve that enlarges radii in gullet areas prone to cracking, relative to other gullet areas.

A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a first sealing zone, and an adjacent weakening zone. The weakening zone may be a heated perforator, includes a heating wire, or be disposed to create an auxiliary sealed area. The heating wire can have, connected thereto, a source of power that is at an adjustable voltage or magnitude, and / or pulsed, and / or a feedback loop. The heating wire may be an NiCr wire and make intermittent contact with the web and be disposed in an insert. The weakening zone may create a line of weakness that is uniform or varies in intensity, is a separating zone, or includes a heat film, a toothed blade, a row of pins, a source of air, or a source of vacuum. The sealing zones may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy.

The present disclosure relates to band saw blades often used for cutting wood at a sawmill. A band saw blade has teeth, and at least one tooth has a back angle that is greater than the back angle of conventional band saw blades. The greater back angle results in teeth having a smaller tooth angle so that the teeth make deeper penetration into wood or other materials that are cut by the blade.